itkShrinkImageFilter.h

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/*=========================================================================

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkShrinkImageFilter.h,v $
  Language:  C++
  Date:      $Date: 2008-10-17 20:49:55 $
  Version:   $Revision: 1.43 $

  Copyright (c) Insight Software Consortium. All rights reserved.
  See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.

  Portions of this code are covered under the VTK copyright.
  See VTKCopyright.txt or http://www.kitware.com/VTKCopyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even 
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
     PURPOSE.  See the above copyright notices for more information.

=========================================================================*/
#ifndef __itkShrinkImageFilter_h
#define __itkShrinkImageFilter_h

#include "itkImageToImageFilter.h"

namespace itk
{

template <class TInputImage, class TOutputImage>
class ITK_EXPORT ShrinkImageFilter:
    public ImageToImageFilter<TInputImage,TOutputImage>
{
public:
  typedef ShrinkImageFilter                             Self;
  typedef ImageToImageFilter<TInputImage,TOutputImage>  Superclass;
  typedef SmartPointer<Self>                            Pointer;
  typedef SmartPointer<const Self>                      ConstPointer;

  itkNewMacro(Self);  

  itkTypeMacro(ShrinkImageFilter, ImageToImageFilter);

  typedef TOutputImage                                OutputImageType;
  typedef TInputImage                                 InputImageType;
  typedef typename OutputImageType::Pointer           OutputImagePointer;
  typedef typename InputImageType::Pointer            InputImagePointer;
  typedef typename InputImageType::ConstPointer       InputImageConstPointer;

  typedef typename TOutputImage::RegionType OutputImageRegionType;

  itkStaticConstMacro(ImageDimension, unsigned int,
                      TInputImage::ImageDimension );
  itkStaticConstMacro(OutputImageDimension, unsigned int,
                      TOutputImage::ImageDimension );

  void SetShrinkFactors( unsigned int factors[] );
  void SetShrinkFactors( unsigned int factor );
  void SetShrinkFactor( unsigned int i, unsigned int factor )
    {
    m_ShrinkFactors[i] = factor;
    }

  const unsigned int * GetShrinkFactors() const
    { return m_ShrinkFactors; }

  virtual void GenerateOutputInformation();

  virtual void GenerateInputRequestedRegion();
  virtual void EnlargeOutputRequestedRegion(DataObject *output); 

#ifdef ITK_USE_CONCEPT_CHECKING

  itkConceptMacro(InputConvertibleToOutputCheck,
    (Concept::Convertible<typename TInputImage::PixelType, typename TOutputImage::PixelType>));
  itkConceptMacro(SameDimensionCheck,
    (Concept::SameDimension<ImageDimension, OutputImageDimension>));

#endif

protected:
  ShrinkImageFilter();
  ~ShrinkImageFilter() {};
  void PrintSelf(std::ostream& os, Indent indent) const;

  void ThreadedGenerateData(const OutputImageRegionType& outputRegionForThread,
                            int threadId );

private:
  ShrinkImageFilter(const Self&); //purposely not implemented
  void operator=(const Self&); //purposely not implemented

  unsigned int m_ShrinkFactors[ImageDimension];
};

  
} // end namespace itk
  
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkShrinkImageFilter.txx"
#endif
  
#endif

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